Hydrogel templated CdS quantum dots synthesis and their characterization

Şahiner, Nurettin; Sel, Kıvanç; Meral, Kadem; Onganer, Yavuz; Bütün, Sultan; Özay, Özgür; Silan, Coşkun

doi:10.1016/j.colsurfa.2011.09.006

Cited by 31 publications

(19 citation statements)

References 42 publications

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“…S3). E g1 can be attributed to the energy band gap of X-inulin, whereas E g2 can be interpreted as the energy band gap of CdS, which is compatible with the values reported for CdS films in the literature, between 2.1 and 2.9 eV [25,26].…”

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confidence: 60%

Synthesis and Properties of Inulin Based Microgels

Şahiner

Sagbas

Yoshida

et al. 2014

Colloids and Interface Science Communications

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Cross-linked inulin (X-inulin) microparticles were synthesized in reverse micelles using water-in-oil microemulsion polymerization. Linear inulin was crosslinked with divinyl sulfone (DVS) in a sodium bis(2-ethylhexyl) sulfosuccinate (AOT) inverse microemulsion under basic conditions. These particles were demonstrated to be excellent scaffolds for the in situ synthesis of CdS quantum dots (Q-dots). The inulin-based particles were shown to be non-cytotoxic in fibroblast cell culture, and degradable under acidic and basic conditions. Furthermore, gallic acid and caffeine were used as model drugs for loading and release studies from these particles, illustrating their potential as drug carriers with controlled release.© 2014 Published by Elsevier B.V.Inulin, a β(2-1) linked polysaccharide of D-fructose, is a naturallyoccurring, linear biopolymer found in many plants [1,2]. Inulin is used in various dairy products as a texture improvement agent and is found in a variety of vegetables and fruits such as onion, garlic, banana and chicory [3,4]. Inulin is assumed to be an important food additive due to prebiotic and other protective effects [1][2][3][4]. Therefore, the degradation of inulin as food additive is affected by the food processing temperature and the pH of the medium [5][6][7]. The advantages of inulin are safety, nontoxicity, ability to form gels, hydrophilicity, biocompatibility, and biodegradability [8][9][10]. Polysaccharides are often used to prepare microparticles because of their excellent properties for nutritional and medicinal applications. Natural biopolymers such as polysaccharides have been widely used as active agent carriers i.e., in drug delivery systems, tissue engineering, pharmaceuticals, and cosmetics [9,[11][12][13][14]. Moreover, hydrogel microparticles with high water absorption capacity can also interact with active agents such as drugs via suitable functional groups for controlled delivery [12].In this study, we describe the preparation and characterization of X-inulin particles and some of their applications. Cross-linked inulin hydrogel particles were synthesized using water-in-oil microemulsion system according to the previously reported method [13] that was the same as preparation of hyaluronic acid, carboxymethyl cellulose and κ-carrageenan particles [14]. Degradation of X-inulin particles was investigated by placing about 20 mg of dried X-inulin particles in a 10 mL buffer solution at pH 2.4 and 10.9 prepared from sodium citrate and hydrochloric acid, and sodium phosphate (Na 2 HPO 4 ) and NaOH, respectively in water bath at 37°C under constant shaking. At certain time intervals, the particles were removed from buffer solutions, centrifuged at 10 000 rpm, and washed with water and after three cycles of centrifugation in acetone, the particles were dried at 50°C until constant weight was attained. Finally, the X-inulin weight losses against incubation time were graphed. To prepare Q-dots within X-inulin particles, 0.2 M 40 mL CdCl 2 solution was prepared, and to this solution, 50...

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confidence: 60%

Synthesis and Properties of Inulin Based Microgels

Şahiner

Sagbas

Yoshida

et al. 2014

Colloids and Interface Science Communications

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“…Hydrogels also have been proven as potential containers for the fabrication of various metal chalcogenide‐based QDs (mostly Cd‐containing) for optical and biological applications. However, the utility of such hydrogels is restricted either due to toxicity issues or lower emission intensities 21–23. So far, surface modified QD‐based WLE hydrogel materials have not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Preserving the stability and activity of an enzyme against harsh conditions (like high temperature, pH, non‐aqueous solvents, and chemical denaturants) is an important research endeavor for facile biocatalysis. Besides several strategies, the immobilization of enzymes is a critical factor for their performance in biochemical transformations and industrial processes 21–25. Recent advances in the immobilization of different enzymes on nanoscale materials have gained much attention due to enhancement in their activity 24–28.…”

Section: Introductionmentioning

confidence: 99%

Engineering Quantum Dots with Ionic Liquid: A Multifunctional White Light Emitting Hydrogel for Enzyme Packaging

Shet

Bisht

Pramanik

et al. 2020

Advanced Optical Materials

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Herein, a new and straightforward approach for the fabrication of a stable and multifunctional white light emitting (WLE) hydrogel is reported. For the first time, the utility of such hydrogels for protein packaging with enhanced activity and stability is presented. Initially, a WLE composite with color chromaticity of (0.33, 0.27) is fabricated by engineering the surface of an orange light emitting Mn2+‐doped ZnS quantum dot (QD) using a blue‐emitting choline‐tosylate ionic liquid (IL). The color chromaticity can be tuned by altering the concentration of the IL and excitation wavelengths. The WLE hydrogel is constructed through the conjugation of the WLE QD‐IL composite with an alginate biopolymer. Remarkably, the WLE QD‐IL composite and WLE hydrogel show preservation of their structural and luminescence properties for an extended time and thus indicate a potential for storage applications. When cytochrome c (Cyt C) is caged within the WLE hydrogel matrix, the peroxidase activity increases by more than 1.7‐times compared with native Cyt C and a Cyt C‐loaded QD hydrogel at room temperature. Also, Cyt C‐immobilized WLE hydrogel shows a 3.5‐fold increase in activity (compared with native Cyt C) at a higher temperature (120 °C) and in the presence of a denaturation agent.

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“…Materials having both inorganic and organic characteristics were well researched [19][20][21][22][23]. Recently, many techniques [24][25][26][27][28] were developed to prepare the new potential materials that were used in various fields [29][30][31][32][33] such as biological labeling, light-emitting diodes, transistors, solar cells, organic-based electronics, sensors, optical switching, etc.…”

Section: Introductionmentioning

confidence: 99%

The effect of alumina content on the structural properties of ZrO2-Al2O3 unstabilized composite nanopowders

Nouri¹,

Shahmiri²,

Rezaie³

et al. 2012

International Journal of Industrial Chemistry

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Homo-and copolymers of 2-(N-phthalimido)ethyl methacrylate (NPEMA) and p-chlorophenyl methacrylate (PCPMA) were prepared in N,N-dimethyl formamide (DMF) solution at 70 °C using 2,2-azo-bisisobutyronitrile (AIBN) as initiator. The nano-CdS-doped polymer composite of NPEMA and PCPMA was prepared via in situ technique. The homo-and copolymers of NPEMA and PCPMA were characterized using FT-IR spectroscopy and gel permeation chromatography (GPC). The polymer nano composites were characterized using FT-IR spectroscopy, X-ray diffraction, and transmission electron microscopy. The reactivity ratios (r 1 and r 2 ) were obtained from the various linear graphical methods. The values of r 1 (NPEMA) = 0.55 and r 2 (PCPMA) = 1.30 were found from the same graphical methods. The copolymer microstructures were found from the mean sequence length, run number, and dyad fraction. Thermal behavior of polymers and polymer nano composites under nitrogen atmosphere was studied. The activation energies of neat polymers were varied in the range of 56-85 kJ/mol, while 28-56 kJ/mol energies were found for nano-CdS-doped polymer composites. The thermodynamic parameters of thermal degradation were also obtained. Kinetic and thermodynamic parameters were confirming the stability of the neat polymers than polymer nano composites. The polymers were assessed on different microorganisms for obtaining the antimicrobial properties. Overall, the polymers permit 10-52, 20-58, and 18-56% growth of bacteria, fungi, and yeast, respectively.

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Hydrogel templated CdS quantum dots synthesis and their characterization

Cited by 31 publications

References 42 publications

Synthesis and Properties of Inulin Based Microgels

Synthesis and Properties of Inulin Based Microgels

Engineering Quantum Dots with Ionic Liquid: A Multifunctional White Light Emitting Hydrogel for Enzyme Packaging

The effect of alumina content on the structural properties of ZrO2-Al2O3 unstabilized composite nanopowders

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